Furnace and grate-bar therefor



EREFOR.

l. S. SKELLY.

FURNCE AND @HATE BAR TP APP'UCATIUN FILED OCT YRK.

FDM' 'NAE AND GEATE-'B THEREF'FJ.

Application filed ctober 16, i919. Serial No.

To VuZZj/w/io'ln t may concern? Be it known that i, JOHN S. SKELLY, a citizen 'of thev United States, residing at Monoiigaheia, wWashington county7 State of Pennsylvanie, have invented a certain new enfinsetui improvement iii Furnaces and @hoteliers i`herefor,oi" which the "following is i full, Clear, and exact description.

iii/'invention relates t0 :i neu7 and improved under-feed Stoker furnace and grate bars therefor and hasfor its object to provide s grate having movzibie and station any grate bars so Closely adjacent as to pie vent substantiel downward sifting of {iiie cosi ashes and yet so Constructed as to permit sirto pass through the grate from bottom to top. It further has for its object to produce e, non-sifting grate throiigh which the air can pass i'reey and from which bars can he removed und replaced Without distui'hing the oth-ers. Heretofoi'e grate hars have been spa/eed so as to permit air to freely pass upward between the hers :it di points. This 'free passage mede the spacing' sneh as to permit ciinsidei'zihie ashes and fine cosi to haii downward. in order to prevent this tuning, overiapping izinges have been pissed between adjacent hers tendingto retard the downward sitting of fishes und cosi, Such dunges or ribs, however, produce :i needlessly heavy end huiiiy grate eieiiient, and, furthermore, make it difficult vto remove sind repiace bars when necessary or dosiited, and in'ipossihle to remove bei* without distui'hiiigg others.

@ne feature of my invention consists in forming recesses in one ot eheh 'two oppost'aees of adjacent hers, of which `ietesses are in eoinn'iunieution with the air Chamber below the grate. ifinothei feature consists in cutting sway the lower portion oi the other opposingl i'iioe so is tio secure the communication above referred to. Another fezitui'e consists in placing the bars so close together as to substantieiiy preventsiitiiig of ashes and fine Cosi; this being possihie because the spzces between the hars not relied on for the passage ot air. The 'foiiov-Jing is i description of my invention, reference being had to aecoin- 4 ng drawings, in which,

igui'e "i shows in pian e section of a furnsoe having a grate embodying invention, the embodiment being shown for soir Speccaton of Letters atent. i

the iowei' ends venieiice in conneetion with s contrai i hailing grate hers on eieh side;

Eig. 2 shows e, pien View one movebie grate bars ot' the .qi-zito Fig. 3 shows en eievzition of' one said har;

Fig. i shows pien -vie stationary bars oi the e;

Fig. 5 shows an eievetion ot one side of the same, and

` 6 shows a transverse section of e. oi

rahty of movable and stet-ioi'iary hors on line 6 6, Fig. l. i Referring more pziitieuieiiy to the' ings, l are inovrihie grate hars which' note with stationary grate 2j ing iis many such movshie hars as are necessary to inziiie up :i grate oi the desired length. stationery'ibzii's are supported :it their upper ends by the side 'uiis 3 of aretort, Whiiethe iov-,ier "7 ends ot hot-h the stationary and hars :ire supported hy the "."feii in siii' ehuinher rihe stationery hai-s are provided with notches. (i into which uoper edge ot theretort wait to the stationery 1oars in i'ixed position. Cent to these notches are iziiioi'e i Whose upper suri'iiees iie. iii the the top of the retort wail sothzis hey ser r' to support the upper ends of nio` i' grate hars and relieve ti e relative upper wnli of retort from weer the moven'ient of sneh more?. Y- iiiovahievl'oziis are providefji wi' Q @is so extensions forming extends the innige ported hy the Wiiii chamber 5 'from the grate hars l and 2 are uhu i hun tudinzii passages i3, as shown in l heilig` provided in their hott fu at 15 and 16 so that. in the fin* they reeeive et the ports 15 a Chamber 12, some oi which is d fue! above the retort through vyers .f

While' the balance passes through tuiou-i iai' passages 13 and is discharged tiiouffii the porfis 1G into the air cheminer 5 iii-oi which it passes upward thfiugh the to the supei'imposed fuel. roche? ,om

l0 are mused to osciiizite hy snitehie iii-eens in si weii known roanne?, czuisingthe n' v ehie eerste reciprocate. The @mistress-,en

and

as thus far described is substantially the construction of the furnace of the )atent to it'. ll. lliood, No. 818,010, dated hpril 17, 1906, which shows one of the types of stoker furnaces in which my invention can be embodiedn ln embodying my invention, l construct the grate bars so that when they are assembled one of each pair of opposing faces is provided with elongated recesses 18, which extend from the top surface of the ba-rs in which they are located to at least the medial portion of their sides, these recesses being so disposed that their longitudinal axes are approximately horizontal when the grate bars are installed, as shown in Fig. 1, the partitions 19 between the recesses heilig also approximately horizontal. The other opposing face has its lower portion cut away from a point near its top downward so as to form alongitudinal recess 2O substantially parallel to the axis of its bar and lcaveat the upper portion a laterally projecting longitudinal flange 21, which is also parallel to the axis of its bar. T he flanges 21 when the bars are assembled are in close proximity to the vertical faces of the partitions 19, but engage the upper portions of those partitions only so that the lower portions of the recesses 18 are in direct communication with thc recesses formed in adjacent bars be-I low the flange 21, and through them with the air chamber 5.

1n practice l prefer to have the bars so constructed that of a given series of bars all the sides facing in one direction shall be provided with recesses 18, while the'other sides of the bars are provided with recesses 2()v and. flanges 21. As a. result the bodies of both the movable and stationary bars will have the same configuration, the differences being at their upper ends, said differences consisting in the means for providing the notch 8 on the movable bars, the projections 7 on the stationary bars and the notch 6.

The faces containing the cut-away portions 20 and flanges 21 have at their respective ends two surfaces 22 and 23, which are ,vertical and extend from top tolrbottom.

rlie surfaces containing the recesses 18 have vat their lower ends portions 24 which lie in vertical planes extending upwardly from the bottoni on the several bars and beginning at the ends 25 of inclined portions 2G upon the lower parts of the central portions of the faces containing the recesses 18. T he upper end of each bar is provided on the side containing the recesses 18with two ribs 2T and 28, extending upwardly from the bottoni and whose faces lie rin a vertical plane corresponding tp the vertical plane of the partitions 19 and surface 24. Between these ribs is a projection 29 whose face is inf'the same plane as the faces of ribs 2T and 28, thus forming a bifurcated passage 30 the lower end of which connects with the air chamber 12 so that some air passes directly from that chamber between the upper ends of the bars to the fuel above said ends, thus reducing` the tendency of the air to pass between the bars from the chamber 12 to the chamber 5. rThe portion 31 of the face beyond the rib 28 is slightly cut away, as shown in Figs. 2 and L1, so that two adjacent bars do not contact at their eXtreme upper ends, this provision being for the sake of reducing-the lateral friction.

In the operation of the furnace as shown air under pressure is fed'to the air chamber 12, from whence some of it passes through the passages 30 between the bars, while the remainder passes into theA ports at 15. 0f the air wliich'passes into the ports 15 some is discharged through the twyers 17, while the rest traverses the passages 13 in the bars and is dischargedv through the ports 16 into the air chamber 5, from whence it passes upward through the spaces provided by the longitudinal recesses 2O and the elongated recesses 18 to the superimposed fuel. The bars 1 and 2 are placed so close together as not to permit any considerable amount of ashes or tine coal to fall between them and eachv movable bar is independently removable and replaceable without disturbing any others, while the stationary bars 2 are removable upon the removal of a mo Yable adjacent bar 1. Since one of any two opposing faces of adjacent bars is provided with a series of elongated recesses 18 extending from the top of their bar approximately to the medial line, while the lower portion of the other opposing face is cut away as at 2() so as to uncover the lower ends of said elongated recesses, those lower ends are in communication with the air chamber 5, with the result that although the bars 1 and 2 may be closer together than was permissible in the grate of Nood Patent No. 818,010 above referred to, air can pass freely through the grate which they compose to the superimposed fuel.

From the foregoing it will be seen that I rely on the closeness of the opposingsides of two adjacent bars to prevent the sifting of ashes and coal, and secure the free passage of air through the grate by means of recesses in said sides. The air which passes through said recesses tends to blow to the top of the grate any ashes or fine coal which may siftpart way between the bars and the fact that the air in passing from the chamber 5 and through the recesses 18 follows a mewhat tortuous path results in its swirling. so'that it is more apt to pick up and ,carry along such sifting ashes or coal.

l The dimensions of the grate bars hereinabove described car? be kept the same as those of the grate of Patent No. 818,010, and yet sifting can be substantially pre- Vrecess adjacent to its lower angles to vented and a free passage of lair through the gra-te permitted without interfering with their removability.

fis Ywill be evident to those skilled in the art, my invent-ion permits of various modiications without departing from the spirit thercol'l or the scope of the appended claims.

`What l claim is: A

l. i tubular grate bar provided with inlet and outlet openings in its bottom and having in the upper portion of one Side a plurality of elongated recesses arranged at acute angles to the longitudinal vaxis of the bar and onthe other side adjacent to the bottom of the bar a longitudinal recess parallel to the longitudinal axis of the bar, and adapted to communicate with the elongated recesses of asimilar' bar when lplaced adjacent thereto.

2. tubular grate bar provided with inlet and outlet openings in its bottom and having in the upper portion of one side a plurality of elongated recesses arranged at acute angles to the longitudinal axis of the bar, and having on its other side a longitudinal edge and subi stantially parallel with the longitudinal axis ot said bar, said elongated recesses extending to approximately the central portion of the side `of the bar in which they are formed, and adapted to communicate with the longitudinal recess of a simila bar when placed adjacent thereto.

3. ln a furnace, a plurality of inclined bars arranged-adjacent to one another, the sides of said bars facing in one direction having a plurality of approximately horizontal elongated recesses arranged at acute the longitudinal axes of said bars,

the other sides of said bars having adjacent to their lower edges longitudinal recesses communicating with elongated recesses of adjacent bars, and means for directing air through said longitudi al and elongated 'recesses.

4. ln a furnace, the combination of a retort, a plurality of grate bars supported adjacent thereto ,and inclined downwardly away from said retort, one of each two opposing faces oit adjacent bars being provided with approximately horizontal elongated recesses at an angle to the longitudinal axis of their bar and one opposing tace having adjacent to its lower edge a longitudinal recess parallel to the longitudinal axis of its bar and communicating with the elongated recesses, the ends of said bars having contacting vertical faces, and means for directing air through said longitudinal and elongated recesses.

5. ln a furnace, a plurality of inclined grate bars arranged adjacent to one another, an air chamber beneath them, the opposing faces of said bars being so close as to prevent the substantial downward sitting or" fine coal and ashes, one ot' each pair of opposing faces having approximately horizontal elongated recesses formed in its upper portion at an acute angle to the axis ot said bar and the lower part of the other of each pair of opposing faces being cut away so that said recesses are connected with th'e air space beneath the grate so as to permit the itree passage of air through said grate, the upper and lower end portions ot said bars being provided with vertical side 'faces extending upward from the bottoms ot said bars.

JOHN S. SKELLY. 

